US5216351A - Cascaded switching and series regulators - Google Patents

Cascaded switching and series regulators Download PDF

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Publication number
US5216351A
US5216351A US07698593 US69859391A US5216351A US 5216351 A US5216351 A US 5216351A US 07698593 US07698593 US 07698593 US 69859391 A US69859391 A US 69859391A US 5216351 A US5216351 A US 5216351A
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Prior art keywords
voltage
error amplifier
output
regulator
receptive
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Expired - Lifetime
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US07698593
Inventor
Sadashi Shimoda
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Seiko Instruments Inc
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Seiko Instruments Inc
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    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05FSYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10Regulating voltage or current
    • G05F1/46Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • G05F1/563Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices including two stages of regulation at least one of which is output level responsive, e.g. coarse and fine regulation
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05FSYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10Regulating voltage or current
    • G05F1/46Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/62Regulating voltage or current wherein the variable actually regulated by the final control device is dc using bucking or boosting dc sources
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M2001/0045Converters combining the concepts of switch-mode regulation and linear regulation, e.g. linear preregulator to switching converter, linear and switching converter in parallel, same converter or same transistor operating either in linear or switching mode

Abstract

The voltage regulator of the boosting/lowering type is comprised of a switching regulator block and a series regulator block, which are cascade-connected to each other. One input terminal of an error amplifier of the switching regulator block is connected to a dividing node of bleeder resistors in the series regulator block to constitute a regulative feedback loop effective to improve an efficiency of the voltage regulator.

Description

BACKGROUND OF THE INVENTION

The present invention relates to a voltage regulator, and more specifically relates to a voltage regulator of the voltage boosting/lowering type comprised in the combination of a switching regulator block and a series regulator block.

FIG. 2 is a block diagram of the conventional voltage regulator. The regulator is comprised of a switching regulator block 111 and a series regulator block 110. The preceding switching regulator block 111 receives an input voltage VIN at its input terminal 101 and produces a boosted intermediate voltage VSW of a constant level at its junction terminal 102. The succeeding series regulator block 110 receives the intermediate voltage and produces a lowered output voltage VOUT of a constant level at its output terminal 108.

However, the conventional regulator has the following drawbacks. A level of the intermediate voltage VSW at the junction terminal 102 is determined by a resistance ratio of internal voltage-dividing resistors connected to the junction terminal 102. On the other hand, a level of the output voltage VOUT at the output terminal 108 is determined by another resistance ratio of internal voltage-dividing resistors connected to the output terminal 108. Namely, the intermediate voltage VSW at the junction terminal 102 and the output voltage VOUT at the output terminal 108 are determined independently from each other. Therefore, the series regulator block 110 has a voltage conversion efficiency determined by VOUT /VSW which is held constant regardless of an amount of an electric current taken from the output terminal 108, thereby hindering the operative efficiency of the voltage regulator.

SUMMARY OF THE INVENTION

In view of the above noted problem of the prior art, an object of the present invention is to provide an improved voltage regulator of the boosting/lowering type operative to vary the voltage conversion efficiency of the series regulator block according to an amount of the output electric current so as to regulatively obtain an optimum efficiency. More particularly, a regulative feedback loop is provided such that a regulative voltage taken from a part of the internal voltage-dividing resistors in the series regulator block is fed back to one of input terminals of a differential or error amplifier of the preceding switching regulator block, thereby improving the voltage conversion efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a circuit diagram of the inventive voltage regulator;

FIG. 2 is a block diagram of the conventional voltage regulator;

FIG. 3 is a graph showing the relation between an amount of an output electric current and a voltage drop value across a control transistor; and

FIG. 4 is a graph showing the relation between an amount of the output electric current and the voltage conversion efficiency of the inventive regulator.

DETAILED DESCRIPTION OF EMBODIMENT

Hereinafter, an embodiment of the invention will be described in detail in conjunction with the drawings. FIG. 1 shows a circuit diagram of the voltage regulator according to the invention. The voltage regulator is comprised of a preceding switching regulator block 11 and a succeeding series regulator block 10, which are preferably integrated into one chip of a semiconductor device to form a monolithic MOS IC device.

The switching regulator block 11 receives an input voltage VIN at its input terminal 1, and produces an intermediate voltage VSW at its junction terminal 2 through a coil and a diode. There is provided an error amplifier 3 or differential amplifier operative to regulate a level of the intermediate voltage VSW at the junction terminal 2, according to a difference between a regulative voltage VFB fed to a negative input terminal of the error amplifier 3 and a reference voltage VREF1 supplied to a positive input terminal of the amplifier 3. An output terminal of the error amplifier 3 and another output terminal of an oscillating circuit 4 are connected to a gate electrode of a control transistor 6 through a gate circuit 5 to constitute a basic circuit construction of the switching regulator block 11 of the voltage boosting chopper type operative to boost the input voltage VIN according to well known principles.

Further, the junction terminal 2 of the switching regulator block 11 is connected to an output terminal 8 of the series regulator block 10 through a control transistor 7 so as to produce a constantly regulated output voltage VOUT. The output voltage VOUT is fed back through one of voltage-dividing or bleeder resistors 121 and 122 which are connected between the output terminal 8 and the ground, to a positive input terminal of an error amplifier 9 which has a negative input terminal receptive of a given reference voltage VREF2. An output terminal of the error amplifier 9 is connected to a gate electrode of the control transistor 7, thereby constituting the series regulator block 10, operative to lower the intermediate voltage VSW to the output voltage VOUT of a constant level.

Further, the negative input terminal of the error amplifier 3 and the positive input terminal of the error amplifier 9 are interconnected to one another to constitute a regulative feedback loop.

Next, the operation of the FIG. 1 circuit is described in detail. The regulative voltage VFB is fed back to the negative input terminal of the error amplifier 3 of the switching regulator block 11 from a junction node between the bleeder resistors 121 and 122 of the series regulator block 10. Hence, the intermediate terminal 2 develops the intermediate voltage VSW having a level identical to the sum of the output voltage VOUT at the output terminal 8 and a drop voltage drop developed across the control transistor 7. The voltage drop through the control transistor 7 varies according to the output electric current taken from the output terminal 8.

FIG. 3 indicates a graph showing this relation. As the output electric current IOUT increases as indicated in the horizontal axis of the graph, the voltage drop linearly increases across the control transistor 7. On the other hand, in the prior art, the voltage drop is kept constant, as indicated by the broken line of the FIG. 3 graph, in a range where the output electric current IOUT is relatively small. Namely, in the present invention, the intermediate voltage VSW at the junction terminal 2 is varied according to the output electric current value, hence the efficiency VOUT /VSW of the series regulator block 10 is optimumly regulated as indicated by a graph of FIG. 4. In the graph, the solid line shows the change of efficiency according to the invention, and the broken line shows the change of efficiency in the prior art. As understood from the graph, the inventive regulator has an efficiency better than that of the prior art in a range where the output electric current is small.

In the FIG. 1 regulator, the negative input terminal of the error amplifier 3 is connected to the positive input terminal of the error amplifier 9. However, the invention is not restricted to such a construction, but generally a regulative voltage can be fed from a part of the bleeder resistors 121 and 122 to the negative input terminal of the error amplifier 3.

As described above, according to the invention, a regulative voltage is taken from a part of the bleeder resistors in the series regulator block, and is fed back to one input terminal of the error amplifier in the switching regulator block, thereby advantageously realizing an improved voltage regulator of the boosting/lowering type having a high efficiency.

Claims (7)

What is claimed is:
1. A voltage regulator comprising: a leading switching regulator block including a first error amplifier having input terminals, an oscillating circuit, a switching transistor receiving a signal from the oscillating circuit in accordance with a signal from the first error amplifier and a coil connected to the switching transistor; and a following series regulator block including a control transistor, and bleeder resistors for feeding back a regulative voltage to one of the input terminals of the first error amplifier and to the gate of the control transistor for effecting a voltage drop from the output from the leading switching regulator block controlled by the regulative voltage.
2. A voltage regulator as claimed in claim 1, wherein the gate of the control transistor is connected to an output terminal of a second error amplifier included in the following series regulator block.
3. A voltage regulator as claimed in claim 2, wherein one of the input terminals of the second error amplifier is connected to a junction node between the bleeder resistors.
4. A voltage regulator comprising:
first regulating means receptive of an input voltage for producing a boosted intermediate level voltage output; and
second regulating means receptive of the intermediate level voltage output for producing a lower regulated voltage output, the second regulating means comprising a control transistor receptive of the intermediate level voltage for effecting a voltage drop thereacross to produce the regulated voltage output and having a gate input for determining the voltage drop, and control means receptive of the regulated voltage output for producing a control signal corresponding to the regulated voltage and for applying the control signal to the gate of the control transistor.
5. A voltage regulator according to claim 4, wherein the means for producing the control signal comprises bleeder resistors receptive of the regulated voltage output to divide same, and means for applying the divided voltage to the gate of the control transistor.
6. A voltage regulator according to claim 5, wherein the first regulating means comprises an error amplifier receptive of the divided voltage and a reference voltage, a switching transistor receptive of an output from an oscillating circuit and the error amplifier, and a coil connected to the switching transistor for boosting the input voltage.
7. A voltage regulator according to claim 5, wherein the means for applying the divided voltage comprises a second error amplifier receptive of the divided voltage and a reference voltage.
US07698593 1990-05-16 1991-05-10 Cascaded switching and series regulators Expired - Lifetime US5216351A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP12579490A JP2706740B2 (en) 1990-05-16 1990-05-16 Voltage regulator
JP2-125794 1990-05-16

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US5216351A true US5216351A (en) 1993-06-01

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US07698593 Expired - Lifetime US5216351A (en) 1990-05-16 1991-05-10 Cascaded switching and series regulators

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JP (1) JP2706740B2 (en)
KR (1) KR0180239B1 (en)
GB (1) GB9110548D0 (en)

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5396412A (en) * 1992-08-27 1995-03-07 Alliedsignal Inc. Synchronous rectification and adjustment of regulator output voltage
US5424898A (en) * 1991-08-16 1995-06-13 Donnelly Corporation Fault tolerant drive circuit for electrochromic mirror system
WO1995034121A1 (en) * 1994-06-03 1995-12-14 Philips Electronics N.V. Power supply with improved efficiency, transmitter comprising such a power supply
US5525895A (en) * 1994-10-27 1996-06-11 At&T Corp. Power supply for portable telephone
US5530635A (en) * 1992-10-12 1996-06-25 Nemic-Lambda Kabushiki Kaisha Power supply
US5563498A (en) * 1991-07-17 1996-10-08 Halcro Nominees Pty Ltd. Power supply regulator
US5592072A (en) * 1995-01-24 1997-01-07 Dell Usa, L.P. High performance dual section voltage regulator
US5691629A (en) * 1995-07-13 1997-11-25 The United States Of America As Represented By The Secretary Of The Air Force Non-volatile power supply having energy efficient DC/DC voltage converters with a small storage capacitor
DE29616457U1 (en) * 1996-09-23 1998-01-29 Bosch Gmbh Robert Circuitry for converting a DC voltage into another DC voltage while regulating the voltage to a predetermined value deliverable
US5828204A (en) * 1995-07-14 1998-10-27 Hewlett-Packard Company Power supply with minimal dissipation output stage
WO1999003028A1 (en) * 1997-07-10 1999-01-21 Korea Advanced Institute Of Science & Technology Hybrid regulator
US5886509A (en) * 1997-03-19 1999-03-23 Robert Bosch Gmbh Voltage stabilizer having an inphase regulator
US5949223A (en) * 1996-03-08 1999-09-07 Canon Kabushiki Kaisha Power source apparatus having first and second switching power source units
US6232752B1 (en) 1999-11-10 2001-05-15 Stephen R. Bissell DC/DC converter with synchronous switching regulation
EP1185147A1 (en) * 2000-03-17 2002-03-06 Tridonic Bauelemente GmbH Voltage supply for Leds in lighting applications
US20020113580A1 (en) * 2001-01-18 2002-08-22 Sluijs Ferdinand Jacob DC/DC up/down converter
US6441591B2 (en) 2000-03-17 2002-08-27 Nokia Mobile Phones Ltd. Linear regulator with conditional switched mode preregulation
US20020125868A1 (en) * 2000-01-27 2002-09-12 William Pohlman Apparatus for providing regulated power to an integrated circuit
US6600297B2 (en) * 2001-03-29 2003-07-29 Koito Manufacturing Co., Ltd. Power supply unit for regulating output voltage using a series regulator
US6667602B2 (en) 2002-03-08 2003-12-23 Visteon Global Technologies, Inc. Low frequency switching voltage pre-regulator
US6707280B1 (en) * 2002-09-09 2004-03-16 Arques Technology, Inc. Bidirectional voltage regulator sourcing and sinking current for line termination
US20040178776A1 (en) * 2003-03-13 2004-09-16 Semiconductor Components Industries, Llc Method of forming a power supply system and structure therefor
US6900621B1 (en) * 2003-07-03 2005-05-31 Inovys Digitally controlled modular power supply for automated test equipment
US20050242792A1 (en) * 2004-04-30 2005-11-03 Raymond Zinn High efficiency linear regulator
US20060002220A1 (en) * 2004-07-02 2006-01-05 Seagate Technology Llc Assessing energy requirements for a refreshed device
US20060033481A1 (en) * 2004-08-06 2006-02-16 Gerhard Thiele Active dropout optimization for current mode LDOs
US20060164049A1 (en) * 2001-12-19 2006-07-27 Thomas Duerbaum Method of power supply to low-voltage power consumers
US7098633B1 (en) * 2005-07-15 2006-08-29 Analog Devices, Inc. Boost converter with series switch
US20060273767A1 (en) * 2002-02-06 2006-12-07 Tatsuya Fujii Method and apparatus for high-efficiency DC stabilized power supply capable of effectively reducing noises and ripples
US20070132318A1 (en) * 2004-03-26 2007-06-14 Enocean Gmbh Arrangement comprising at least one electrical voltage source and a first voltage converter circuit
US20070200539A1 (en) * 2006-02-27 2007-08-30 Ramkishore Ganti System with linear and switching regulator circuits
US20070210775A1 (en) * 2006-03-08 2007-09-13 Broadcom Corporation Power supply integration for low power single chip RF CMOS solutions for use in battery operated electronic devices
US20080007234A1 (en) * 2006-06-26 2008-01-10 Hideki Agari Voltage regulator
DE102006038158A1 (en) * 2006-08-16 2008-02-21 Infineon Technologies Ag Voltage supply device for use in mobile communication device, has switch regulator with input coupled with voltage input, and voltage regulator coupled with output of switch regulator, where voltage regulator is coupled with voltage output
US20080303493A1 (en) * 2007-06-11 2008-12-11 Pacifictech Microelectronics, Inc. Boost regulator startup circuits and methods
US20090219004A1 (en) * 2008-02-28 2009-09-03 Fujitsu Mecroelectronics Limited Power supply control device and power supply control method
US8023290B2 (en) 1997-01-24 2011-09-20 Synqor, Inc. High efficiency power converter
US8072196B1 (en) * 2008-01-15 2011-12-06 National Semiconductor Corporation System and method for providing a dynamically configured low drop out regulator with zero quiescent current and fast transient response
US20130241517A1 (en) * 2012-03-16 2013-09-19 Hon Hai Precision Industry Co., Ltd. Power circuit having three-terminal regulator
USRE46256E1 (en) 2009-02-05 2016-12-27 Advanced Micro Devices, Inc. Asymmetric topology to boost low load efficiency in multi-phase switch-mode power conversion

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CA2393102C (en) * 2000-10-02 2007-01-23 Omron Corporation Power source apparatus
JP4899667B2 (en) * 2006-07-03 2012-03-21 富士ゼロックス株式会社 Power control device
CN103970170B (en) * 2013-01-30 2016-12-28 中兴通讯股份有限公司 One kind of current loop

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GB1095458A (en) * 1965-09-30
JPS56137414A (en) * 1980-03-31 1981-10-27 Anritsu Corp Switching regulator
US4347474A (en) * 1980-09-18 1982-08-31 The United States Of America As Represented By The Secretary Of The Navy Solid state regulated power transformer with waveform conditioning capability
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Cited By (61)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5563498A (en) * 1991-07-17 1996-10-08 Halcro Nominees Pty Ltd. Power supply regulator
US5424898A (en) * 1991-08-16 1995-06-13 Donnelly Corporation Fault tolerant drive circuit for electrochromic mirror system
US5396412A (en) * 1992-08-27 1995-03-07 Alliedsignal Inc. Synchronous rectification and adjustment of regulator output voltage
US5530635A (en) * 1992-10-12 1996-06-25 Nemic-Lambda Kabushiki Kaisha Power supply
WO1995034121A1 (en) * 1994-06-03 1995-12-14 Philips Electronics N.V. Power supply with improved efficiency, transmitter comprising such a power supply
US5552694A (en) * 1994-06-03 1996-09-03 U.S. Philips Corporation Power supply with improved efficiency, transmitter comprising such a power supply
US5525895A (en) * 1994-10-27 1996-06-11 At&T Corp. Power supply for portable telephone
US5592072A (en) * 1995-01-24 1997-01-07 Dell Usa, L.P. High performance dual section voltage regulator
US5691629A (en) * 1995-07-13 1997-11-25 The United States Of America As Represented By The Secretary Of The Air Force Non-volatile power supply having energy efficient DC/DC voltage converters with a small storage capacitor
US5828204A (en) * 1995-07-14 1998-10-27 Hewlett-Packard Company Power supply with minimal dissipation output stage
US5949223A (en) * 1996-03-08 1999-09-07 Canon Kabushiki Kaisha Power source apparatus having first and second switching power source units
DE29616457U1 (en) * 1996-09-23 1998-01-29 Bosch Gmbh Robert Circuitry for converting a DC voltage into another DC voltage while regulating the voltage to a predetermined value deliverable
US5889390A (en) * 1996-09-23 1999-03-30 Robert Bosch Gmbh Circuit arrangement for converting a DC voltage into another DC voltage with simultaneous regulation of the emittable voltage at a predetermined value
US9143042B2 (en) 1997-01-24 2015-09-22 Synqor, Inc. High efficiency power converter
US8023290B2 (en) 1997-01-24 2011-09-20 Synqor, Inc. High efficiency power converter
US8493751B2 (en) 1997-01-24 2013-07-23 Synqor, Inc. High efficiency power converter
US5886509A (en) * 1997-03-19 1999-03-23 Robert Bosch Gmbh Voltage stabilizer having an inphase regulator
WO1999003028A1 (en) * 1997-07-10 1999-01-21 Korea Advanced Institute Of Science & Technology Hybrid regulator
US6130525A (en) * 1997-07-10 2000-10-10 Korea Advanced Institute Of Science And Technology Hybrid regulator
US6232752B1 (en) 1999-11-10 2001-05-15 Stephen R. Bissell DC/DC converter with synchronous switching regulation
US6703814B2 (en) * 2000-01-27 2004-03-09 Primarion, Inc. Apparatus for providing regulated power to an integrated circuit
US20020125868A1 (en) * 2000-01-27 2002-09-12 William Pohlman Apparatus for providing regulated power to an integrated circuit
US6441591B2 (en) 2000-03-17 2002-08-27 Nokia Mobile Phones Ltd. Linear regulator with conditional switched mode preregulation
EP1185147A1 (en) * 2000-03-17 2002-03-06 Tridonic Bauelemente GmbH Voltage supply for Leds in lighting applications
US20020113580A1 (en) * 2001-01-18 2002-08-22 Sluijs Ferdinand Jacob DC/DC up/down converter
US6737838B2 (en) * 2001-01-18 2004-05-18 Koninklijke Philips Electronics N.V. DC/DC up/down converter
US6600297B2 (en) * 2001-03-29 2003-07-29 Koito Manufacturing Co., Ltd. Power supply unit for regulating output voltage using a series regulator
US20060164049A1 (en) * 2001-12-19 2006-07-27 Thomas Duerbaum Method of power supply to low-voltage power consumers
CN100520666C (en) 2002-02-06 2009-07-29 株式会社理光 DC voltage-stablized source apparatus
US7489118B2 (en) * 2002-02-06 2009-02-10 Ricoh Company, Ltd Method and apparatus for high-efficiency DC stabilized power supply capable of effectively reducing noises and ripples
US20060273767A1 (en) * 2002-02-06 2006-12-07 Tatsuya Fujii Method and apparatus for high-efficiency DC stabilized power supply capable of effectively reducing noises and ripples
US6667602B2 (en) 2002-03-08 2003-12-23 Visteon Global Technologies, Inc. Low frequency switching voltage pre-regulator
US6707280B1 (en) * 2002-09-09 2004-03-16 Arques Technology, Inc. Bidirectional voltage regulator sourcing and sinking current for line termination
US20040178776A1 (en) * 2003-03-13 2004-09-16 Semiconductor Components Industries, Llc Method of forming a power supply system and structure therefor
US6850044B2 (en) * 2003-03-13 2005-02-01 Semiconductor Components Industries, L.L.C. Hybrid regulator with switching and linear sections
US6900621B1 (en) * 2003-07-03 2005-05-31 Inovys Digitally controlled modular power supply for automated test equipment
US20070132318A1 (en) * 2004-03-26 2007-06-14 Enocean Gmbh Arrangement comprising at least one electrical voltage source and a first voltage converter circuit
US7436156B2 (en) * 2004-03-26 2008-10-14 Enocean Gmbh Voltage converter circuit providing an usable output voltage from a very low input voltage
WO2005112240A3 (en) * 2004-04-30 2006-10-26 Micrel Inc High efficiency linear regulator
USRE41061E1 (en) * 2004-04-30 2009-12-29 Micrel, Inc. High efficiency linear regulator
US7084612B2 (en) * 2004-04-30 2006-08-01 Micrel, Inc. High efficiency linear regulator
US20050242792A1 (en) * 2004-04-30 2005-11-03 Raymond Zinn High efficiency linear regulator
WO2005112240A2 (en) * 2004-04-30 2005-11-24 Micrel, Inc. High efficiency linear regulator
US20060002220A1 (en) * 2004-07-02 2006-01-05 Seagate Technology Llc Assessing energy requirements for a refreshed device
US7321521B2 (en) * 2004-07-02 2008-01-22 Seagate Technology Llc Assessing energy requirements for a refreshed device
USRE44009E1 (en) * 2004-07-02 2013-02-19 Seagate Technology Llc Assessing energy requirements for a refreshed device
US7282895B2 (en) * 2004-08-06 2007-10-16 Texas Instruments Incorporated Active dropout optimization for current mode LDOs
US20060033481A1 (en) * 2004-08-06 2006-02-16 Gerhard Thiele Active dropout optimization for current mode LDOs
US7098633B1 (en) * 2005-07-15 2006-08-29 Analog Devices, Inc. Boost converter with series switch
US7759915B2 (en) * 2006-02-27 2010-07-20 St-Ericsson Sa System with linear and switching regulator circuits
US20070200539A1 (en) * 2006-02-27 2007-08-30 Ramkishore Ganti System with linear and switching regulator circuits
US20070210775A1 (en) * 2006-03-08 2007-09-13 Broadcom Corporation Power supply integration for low power single chip RF CMOS solutions for use in battery operated electronic devices
US7741818B2 (en) * 2006-06-26 2010-06-22 Ricoh Company, Ltd. Voltage regulator including an output unit for converting input voltage into a predetermined voltage and for outputting the converted voltage
US20080007234A1 (en) * 2006-06-26 2008-01-10 Hideki Agari Voltage regulator
DE102006038158A1 (en) * 2006-08-16 2008-02-21 Infineon Technologies Ag Voltage supply device for use in mobile communication device, has switch regulator with input coupled with voltage input, and voltage regulator coupled with output of switch regulator, where voltage regulator is coupled with voltage output
US20080303493A1 (en) * 2007-06-11 2008-12-11 Pacifictech Microelectronics, Inc. Boost regulator startup circuits and methods
US8072196B1 (en) * 2008-01-15 2011-12-06 National Semiconductor Corporation System and method for providing a dynamically configured low drop out regulator with zero quiescent current and fast transient response
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Also Published As

Publication number Publication date Type
GB9110548D0 (en) 1991-07-03 grant
JP2706740B2 (en) 1998-01-28 grant
JPH0421111A (en) 1992-01-24 application
GB2244155A (en) 1991-11-20 application
KR0180239B1 (en) 1999-04-01 grant

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